NavLinks: Make ordering in navigation configurable (#20382)

The ordering of links in the navigation bar is currently based the order of the slice containing the navigation tree. Since Grafana supports adding more links to the navigation bar with `RunIndexDataHooks` which runs at the very end of the function this means that any link registered through a hook will be placed last in the slice and be displayed last in the menu. With this PR the ordering can be specified with a weight which allows for placing links created by extensions in a more intuitive place where applicable.

Stable sorting is used to ensure that the current FIFO ordering is preserved when either no weight is set or two items shares the same weight.

pkg/api/dtos/index.go

@@ -22,6 +22,23 @@ type PluginCss struct {
 	Dark  string `json:"dark"`
 }
 
+const (
+	// These weights may be used by an extension to reliably place
+	// itself in relation to a particular item in the menu. The weights
+	// are negative to ensure that the default items are placed above
+	// any items with default weight.
+
+	WeightCreate = (iota - 20) * 100
+	WeightDashboard
+	WeightExplore
+	WeightProfile
+	WeightAlerting
+	WeightPlugin
+	WeightConfig
+	WeightAdmin
+	WeightHelp
+)
+
 type NavLink struct {
 	Id           string     `json:"id,omitempty"`
 	Text         string     `json:"text,omitempty"`
@@ -31,6 +48,7 @@ type NavLink struct {
 	Img          string     `json:"img,omitempty"`
 	Url          string     `json:"url,omitempty"`
 	Target       string     `json:"target,omitempty"`
+	SortWeight   int64      `json:"sortWeight,omitempty"`
 	Divider      bool       `json:"divider,omitempty"`
 	HideFromMenu bool       `json:"hideFromMenu,omitempty"`
 	HideFromTabs bool       `json:"hideFromTabs,omitempty"`

pkg/api/index.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"fmt"
+	"sort"
 	"strings"
 
 	"github.com/grafana/grafana/pkg/api/dtos"
@@ -120,6 +121,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			Icon:       "fa fa-fw fa-plus",
 			Url:        setting.AppSubUrl + "/dashboard/new",
 			Children:   children,
+			SortWeight: dtos.WeightCreate,
 		})
 	}
 
@@ -137,6 +139,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 		SubTitle:   "Manage dashboards & folders",
 		Icon:       "gicon gicon-dashboard",
 		Url:        setting.AppSubUrl + "/",
+		SortWeight: dtos.WeightDashboard,
 		Children:   dashboardChildNavs,
 	})
 
@@ -146,6 +149,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			Id:         "explore",
 			SubTitle:   "Explore your data",
 			Icon:       "gicon gicon-explore",
+			SortWeight: dtos.WeightExplore,
 			Url:        setting.AppSubUrl + "/explore",
 		})
 	}
@@ -163,6 +167,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			Img:          data.User.GravatarUrl,
 			Url:          setting.AppSubUrl + "/profile",
 			HideFromMenu: true,
+			SortWeight:   dtos.WeightProfile,
 			Children: []*dtos.NavLink{
 				{Text: "Preferences", Id: "profile-settings", Url: setting.AppSubUrl + "/profile", Icon: "gicon gicon-preferences"},
 				{Text: "Change Password", Id: "change-password", Url: setting.AppSubUrl + "/profile/password", Icon: "fa fa-fw fa-lock", HideFromMenu: true},
@@ -192,6 +197,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			Icon:       "gicon gicon-alert",
 			Url:        setting.AppSubUrl + "/alerting/list",
 			Children:   alertChildNavs,
+			SortWeight: dtos.WeightAlerting,
 		})
 	}
 
@@ -207,6 +213,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 				Id:         "plugin-page-" + plugin.Id,
 				Url:        plugin.DefaultNavUrl,
 				Img:        plugin.Info.Logos.Small,
+				SortWeight: dtos.WeightPlugin,
 			}
 
 			for _, include := range plugin.Includes {
@@ -302,6 +309,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 		SubTitle:   "Organization: " + c.OrgName,
 		Icon:       "gicon gicon-cog",
 		Url:        configNodes[0].Url,
+		SortWeight: dtos.WeightConfig,
 		Children:   configNodes,
 	})
 
@@ -326,6 +334,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 			Id:           "admin",
 			Icon:         "gicon gicon-shield",
 			Url:          setting.AppSubUrl + "/admin/users",
+			SortWeight:   dtos.WeightAdmin,
 			Children:     adminNavLinks,
 		})
 	}
@@ -337,6 +346,7 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 		Url:          "#",
 		Icon:         "gicon gicon-question",
 		HideFromMenu: true,
+		SortWeight:   dtos.WeightHelp,
 		Children: []*dtos.NavLink{
 			{Text: "Keyboard shortcuts", Url: "/shortcuts", Icon: "fa fa-fw fa-keyboard-o", Target: "_self"},
 			{Text: "Community site", Url: "http://community.grafana.com", Icon: "fa fa-fw fa-comment", Target: "_blank"},
@@ -345,6 +355,10 @@ func (hs *HTTPServer) setIndexViewData(c *m.ReqContext) (*dtos.IndexViewData, er
 	})
 
 	hs.HooksService.RunIndexDataHooks(&data)
+
+	sort.SliceStable(data.NavTree, func(i, j int) bool {
+		return data.NavTree[i].SortWeight < data.NavTree[j].SortWeight
+	})
 	return &data, nil
 }